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<head>
<meta charset="utf-8">
<title>css06</title>
<link href="css06.css" rel="stylesheet" type="text/css">
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<body>
	<h2>作业1</h2>
	<div class="box">
		<div class="item1"></div>
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	<h2>作业2</h2>
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		<div class="item2"></div>
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	<h2>作业3</h2>
	<div class="box3">
		<div class="item1"></div>
		<div class="item2"></div>
		<div class="item3"></div>
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</body>
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